US Bridges

Salmon/Boulder RD over North Fork Boulder Creek

Fair

Okanogan County, Washington · No Data Entered · Structure no. 060805000001021

Built
1949
76 years old
Condition
Fair
inspected July 2023
Type
Frame
Concrete Continuous
Length
100 ft
3 main spans
Daily traffic
158
1992 count
Owner
Federal
U.S. Forest Service

About this bridge

Salmon/Boulder RD over North Fork Boulder Creek is a concrete continuous frame carrying Salmon/Boulder RD over North Fork Boulder Creek in Okanogan County, Washington. It was built in 1949, so it is 76 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 158 vehicles a day, roughly 10% of them trucks, projected to reach 237 by 2045. The structure is 100 ft (30.5 m) long and 17 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

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CarriesSalmon/Boulder RD
CrossesNorth Fork Boulder Creek
LocationNo Data Entered
RouteFederal Lands Road 37000
CountyOkanogan County
StateWashington
Coordinates48.5784, -120.16531
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.2 US tons
Inventory rating26.6 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length100 ft (30.5 m)
Longest span60 ft (18.3 m)
Deck width17 ft (5.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic158 (1992)
Projected traffic237 by 2045
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Salmon/Boulder RD over North Fork Boulder Creek built?

It was built in 1949, making it 76 years old in 2025.

What condition is Salmon/Boulder RD over North Fork Boulder Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.

How much traffic does Salmon/Boulder RD over North Fork Boulder Creek carry?

About 158 vehicles per day (1992 count), of which roughly 10% are trucks.

How long is Salmon/Boulder RD over North Fork Boulder Creek?

The structure is 100 ft (30.5 m) long with a longest span of 60 ft (18.3 m) and a deck 17 ft wide.

Who owns Salmon/Boulder RD over North Fork Boulder Creek?

It is owned by the U.S. Forest Service.